note
frozenwithjoy
Perhaps this ([http://search.cpan.org/~saper/constant-1.21/lib/constant.pm#CAVEATS|constant#CAVEATS]):
<blockquote><i>You can get into trouble if you use constants in a context which automatically quotes barewords...</i></blockquote>
<p>And this ([http://search.cpan.org/~roode/Readonly-1.03/Readonly.pm#COMPARISON_WITH_"use_constant"|Readonly#COMPARISON_WITH_"use_constant"]):</p>
<blockquote><i>You have to be very careful in places where barewords are allowed...</i></blockquote>
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